Rotatable shutter arrangement for cinematographic cameras



March 16, 1954 8mg 2,672,073

ROTATABLE SHUTTER ARRANGEMENT FOR CINEMATOGRAPHIC CAMERAS Filed Jan. 17,1950 INVENTOR U x B Patented Mar. 16, 1954 UNITED STATES PATENT OFFICEROTATABLE SHUTTER ARRANGEMENT FOR CINEMATOGRAPHIC CAMERAS 1 Claim. 1

My present application is a continuation-inpart of my U. S. patentapplication Serial No. 775,798, filed on September 24, 1947, nowabandoned. Said U. S. patent application Serial No. 775,798 is acontinuation-in-part of my U. S. patent application Serial No. 534,623,filed May 8, 1944, now abandoned. Said U. S. patent application SerialNo. 534,623 is a continuation-in-part of my U. S. patent applicationSerial No. 340,465, filed June 14, 1940, now abandoned.

My present invention relates to rotatable shutter arrangements forcinematographic cameras.

It is the object of my present invention to provide means for adjustingthe position of the shutter blades for a rotatable shutter duringrotation of the same.

The novel features which I consider as characteristic for the inventionare set forth in particular in the appended claim. The invention itself,however, both as to its construction and its mode of operation will bebest understood from the following description of a specific embodimentwhen read in connection with the accompanying drawing showing a sideview of such embodiment partly in cross section.

The shutter arrangement, according to my present invention, is mainlyemployed in cinematographic cameras where the shutter rotatescontinuously during taking of pictures. In the embodiment shown in thedrawing, the shutter is rotated by means of a pinion 60 which drives thepinion 6| which is mounted on the inner shaft 85. On this inner shaft 85is secured a sleeve 99 which carries the fixed blade 88 of the shutter.The blade 89 of the shutter is movable relative to the fixed blade 88 soas to adjust the shutter opening. For this purpose this movable blade 89is secured to the tubular shaft I which is freely slidably mounted onthe sleeve 98a which in turn is freely slidably and rotatably carried bythe inner shaft 85. In this arrangement the tubular shaft I00 isprovided with a straight longitudinal slot I04 into which projects thepin I03 mounted on sleeve 98a. Furthermore, the inner shaft 85 isprovided with a helical groove I02 which is engaged by the inwardlyprojecting radial pin IOI mounted on sleeve 9811.

As shown, spring I05 is arranged within the tubular shaft I00permanently tending to push the sleeve 98a in outward direction.

As clearly shown in the drawing, sleeve 98a is engaged by the free end83a of the lever 82 which is connected by the removable stud 82b andspring 98 to the adjusting lever arm 18 pivoted at I9. The lever I8 canbe turned together with the lever 82 about pivot III by means of theroller 18a mounted on lever I8. For this purpose the heart-shaped cam 11is provided, turning of which results in corresponding turning of thelevers I8 and 82.

Such turning of lever 82 will result in in- Ward pushing of the sleeve98a and turning of the movable blade 89 relative to the fixed blade 88,if desired. It is evident that by the sliding engagement between thefree lever end 83a and the sleeve 98a. it is possible to adjust, by theabove described arrangement, the relative position of shutter blades 89and 88 during operation of the same.

What I claim is:

Shutter arrangement for a cinematographic camera comprising incombination, a rotatable outer tubular shaft provided with a slotextending parallel to the axis of said shaft over part of the lengththereof; a shutter blade carried by said rotatable outer tubular shaft;a rotatable inner shaft provided with a helical groove in its surfaceand arranged within said rotatable outer tubular shaft and havingprojecting end portions projecting at both ends beyond the ends of saidrotatable outer tubular shaft; another shutter blade carried by oneprojecting end portion of said rotatable inner shaft and cooperatingwith said shutter blade carried by said rotatable outer tubular shaft; apinion firmly secured to said one end portion of said rotatable innershaft coaxially with the same; gear means for rotating said pinion; asleeve member mounted on the other projecting end portion of saidrotatable inner shaft turnably and slidably with respect to the latter;an inwardly projecting projection on said sleeve reaching into saidhelical groove in said rotatable inner shaft; an outwardly projectingprojection on said sleeve reaching into said slot in said rotatableouter tubular shaft; spring means mounted between one of said shafts andsaid sleeve permanently forcing the same in outward direction; andadjusting means abutting against the outer end of said sleeve andpermanently forcing the same in inward direction so as to move saidsleeve and thereby adjust the relative angular position of said shaftsand of the shutter blades carried by the same.

JACQUES BOLSEY.

References Cited in the file of this patent UNITED STATES PATENTS FranceSept. 30. 1935

